I have all three Loki. Lokies? The three band got relegated to the garage system pretty quickly. The Lokius is better but is now in the studio. The Max is a keeper - more bands yield a narrower Q, plus the memory and the ability to switch it in and out from "the seat." I haven't used it a lot because my purchase was looking toward modification of certain recordings, not speakers or the room. Were I to complain I would mention it gets warmer than I expected, give it clearance.
For ref my system is Gato pre, Rose 150b, Marantz SACD, Michell and Pro-Ject TTs, Lounge Audio and Vincent TT pre, Perreaux R350, Martin Logan Expression 13a and various subs. Aside from the usual piano and female vocals I like nylon stringed guitar for comparisons.